Molds & Tooling
2 views
Cold slug marks appear on the product surface
Problem Phenomenon
Cold slug marks appear on the product surface, local poor gloss or hard lumps, usually near the gate
Cause Analysis
Nozzle temperature too low, producing cold slug
Front zone barrel temperature set low
Mold sprue or runner temperature low, cold slug retained
Mold opening gap too large, cold slug pulled into the cavity
Screw pullback distance too large, producing cold slug
Solution
Increase nozzle temperature to prevent cold slug
Appropriately increase the front zone barrel temperature
Increase sprue and runner dimensions to reduce cold slug retention
Reduce the mold opening gap
Adjust the screw pullback distance
Key Takeaway
Cold slug marks require increasing nozzle temperature and reducing cold slug sources
Was this helpful?
0 people found this helpful
Thank you for your feedback!